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                            <b>1.</b>
                        
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                            <b>1.1.</b>
                        
                        动机
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                            <b>1.2.</b>
                        
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                            <b>1.3.</b>
                        
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                            <b>1.4.</b>
                        
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                        生态系统
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                            <b>2.</b>
                        
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                            <b>2.1.</b>
                        
                        Action
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                            <b>2.2.</b>
                        
                        Reducer
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                            <b>2.3.</b>
                        
                        Store
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                            <b>2.4.</b>
                        
                        数据流
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                            <b>2.5.</b>
                        
                        搭配 React
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                            <b>2.6.</b>
                        
                        示例：Todo List
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                            <b>3.</b>
                        
                        高级
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                            <b>3.1.</b>
                        
                        异步 Action
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                            <b>3.2.</b>
                        
                        异步数据流
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                            <b>3.3.</b>
                        
                        Middleware
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                            <b>3.4.</b>
                        
                        搭配 React Router
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                            <b>3.5.</b>
                        
                        示例：Reddit API
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                            <b>3.6.</b>
                        
                        下一步
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                            <b>4.</b>
                        
                        技巧
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                            <b>4.1.</b>
                        
                        迁移到 Redux
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                            <b>4.2.</b>
                        
                        使用对象展开运算符
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                            <b>4.3.</b>
                        
                        减少样板代码
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                            <b>4.4.</b>
                        
                        服务端渲染
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                            <b>4.5.</b>
                        
                        编写测试
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                            <b>4.6.</b>
                        
                        计算衍生数据
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                            <b>4.7.</b>
                        
                        实现撤销重做
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                            <b>4.8.</b>
                        
                        子应用隔离
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                            <b>4.9.</b>
                        
                        组织 Reducer
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                            <b>4.9.1.</b>
                        
                        Reducer 基础概念
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                            <b>4.9.2.</b>
                        
                        Reducer 基础结构
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                            <b>4.9.3.</b>
                        
                        Reducer 逻辑拆分
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                            <b>4.9.4.</b>
                        
                        Reducer 重构示例
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                            <b>4.9.5.</b>
                        
                        `combineReducers` 用法
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                            <b>4.9.6.</b>
                        
                        `combineReducers` 进阶
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                            <b>4.9.7.</b>
                        
                        State 范式化
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                            <b>4.9.8.</b>
                        
                        管理范式化数据
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                            <b>4.9.9.</b>
                        
                        Reducer 逻辑复用
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        <li class="chapter " data-level="4.9.10" data-path="docs/recipes/reducers/ImmutableUpdatePatterns.html">
            
                
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                            <b>4.9.10.</b>
                        
                        不可变更新模式
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                            <b>4.9.11.</b>
                        
                        初始化 State
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                            <b>5.</b>
                        
                        常见问题
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                            <b>5.1.</b>
                        
                        综合
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                            <b>5.2.</b>
                        
                        Reducer
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        <li class="chapter " data-level="5.3" data-path="docs/faq/OrganizingState.html">
            
                
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                            <b>5.3.</b>
                        
                        组织 State
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                    <a href="../../../docs/faq/StoreSetup.html">
                
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                            <b>5.4.</b>
                        
                        创建 Store
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        <li class="chapter " data-level="5.5" data-path="docs/faq/Actions.html">
            
                
                    <a href="../../../docs/faq/Actions.html">
                
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                            <b>5.5.</b>
                        
                        Action
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                            <b>5.6.</b>
                        
                        代码结构
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                            <b>5.7.</b>
                        
                        性能
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        <li class="chapter " data-level="5.8" data-path="docs/faq/ReactRedux.html">
            
                
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                            <b>5.8.</b>
                        
                        React Redux
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        <li class="chapter " data-level="5.9" data-path="docs/faq/Miscellaneous.html">
            
                
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                            <b>5.9.</b>
                        
                        其它
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            </ul>
            
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        <li class="chapter " data-level="6" data-path="docs/Troubleshooting.html">
            
                
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                            <b>6.</b>
                        
                        排错
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        <li class="chapter " data-level="7" data-path="docs/Glossary.html">
            
                
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                            <b>7.</b>
                        
                        词汇表
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        <li class="chapter " data-level="8" data-path="docs/api/index.html">
            
                
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                            <b>8.</b>
                        
                        API 文档
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            <ul class="articles">
                
    
        <li class="chapter " data-level="8.1" data-path="docs/api/createStore.html">
            
                
                    <a href="../../../docs/api/createStore.html">
                
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                            <b>8.1.</b>
                        
                        createStore
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        <li class="chapter " data-level="8.2" data-path="docs/api/Store.html">
            
                
                    <a href="../../../docs/api/Store.html">
                
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                            <b>8.2.</b>
                        
                        Store
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        <li class="chapter " data-level="8.3" data-path="docs/api/combineReducers.html">
            
                
                    <a href="../../../docs/api/combineReducers.html">
                
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                            <b>8.3.</b>
                        
                        combineReducers
                    </a>
            
            
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        <li class="chapter " data-level="8.4" data-path="docs/api/applyMiddleware.html">
            
                
                    <a href="../../../docs/api/applyMiddleware.html">
                
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                            <b>8.4.</b>
                        
                        applyMiddleware
                    </a>
            
            
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        <li class="chapter " data-level="8.5" data-path="docs/api/bindActionCreators.html">
            
                
                    <a href="../../../docs/api/bindActionCreators.html">
                
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                            <b>8.5.</b>
                        
                        bindActionCreators
                    </a>
            
            
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        <li class="chapter " data-level="8.6" data-path="docs/api/compose.html">
            
                
                    <a href="../../../docs/api/compose.html">
                
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                            <b>8.6.</b>
                        
                        compose
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="9" data-path="docs/react-redux/index.html">
            
                
                    <a href="../../../docs/react-redux/index.html">
                
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                            <b>9.</b>
                        
                        react-redux 文档
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            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="docs/react-redux/api.html">
            
                
                    <a href="../../../docs/react-redux/api.html">
                
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                            <b>9.1.</b>
                        
                        API
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        <li class="chapter " data-level="9.2" data-path="docs/react-redux/troubleshooting.html">
            
                
                    <a href="../../../docs/react-redux/troubleshooting.html">
                
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                            <b>9.2.</b>
                        
                        排错
                    </a>
            
            
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                        <a id="edit-link" href="https://github.com/camsong/redux-in-chinese/tree/master/docs/recipes/reducers/ReusingReducerLogic.md" class="btn fa fa-edit pull-left">&#xA0;&#xA0;&#x5F00;&#x59CB;&#x7EA0;&#x9519;</a><h1 id="reducer-%E9%80%BB%E8%BE%91%E5%A4%8D%E7%94%A8">Reducer &#x903B;&#x8F91;&#x590D;&#x7528;</h1>
<p>&#x968F;&#x7740;&#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x7684;&#x589E;&#x957F;&#xFF0C;&#x5728; reducer &#x903B;&#x8F91;&#x4E2D;&#x5F00;&#x59CB;&#x51FA;&#x73B0;&#x4E00;&#x4E9B;&#x5E38;&#x89C1;&#x7684;&#x6A21;&#x5F0F;&#x3002;&#x4F60;&#x53EF;&#x80FD;&#x4F1A;&#x53D1;&#x73B0;&#x4E00;&#x90E8;&#x5206; reducer &#x903B;&#x8F91;&#x5BF9;&#x4E8E;&#x4E0D;&#x540C;&#x7C7B;&#x578B;&#x7684;&#x6570;&#x636E;&#x505A;&#x7740;&#x76F8;&#x540C;&#x7684;&#x5DE5;&#x4F5C;&#xFF0C;&#x4F60;&#x60F3;&#x901A;&#x8FC7;&#x5BF9;&#x6BCF;&#x79CD;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x590D;&#x7528;&#x76F8;&#x540C;&#x7684;&#x516C;&#x5171;&#x903B;&#x8F91;&#x6765;&#x51CF;&#x5C11;&#x91CD;&#x590D;&#x7684;&#x4EE3;&#x7801;&#x3002;&#x6216;&#x8005;&#xFF0C;&#x4F60;&#x53EF;&#x80FD;&#x60F3;&#x8981;&#x5728; store &#x4E2D;&#x5904;&#x7406;&#x67D0;&#x4E2A;&#x7C7B;&#x578B;&#x7684;&#x6570;&#x636E;&#x7684;&#x591A;&#x4E2A;&#x201D;&#x5B9E;&#x4F8B;&#x201C;&#x3002;&#x7136;&#x800C;&#xFF0C;Redux store &#x91C7;&#x7528;&#x5168;&#x5C40;&#x7ED3;&#x6784;&#x7684;&#x8BBE;&#x8BA1;&#x672C;&#x8EAB;&#x5C31;&#x662F;&#x4E00;&#x79CD;&#x6298;&#x8877;&#xFF1A;&#x4F18;&#x70B9;&#x662F;&#x6613;&#x4E8E;&#x8FFD;&#x8E2A;&#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x7684;&#x6574;&#x4F53;&#x72B6;&#x6001;&#xFF0C;&#x4F46;&#x662F;&#xFF0C;&#x4E5F;&#x53EF;&#x80FD;&#x66F4;&#x96BE;&#x7684;&#x201D;&#x547D;&#x4E2D;&#x201C;&#x90A3;&#x4E9B;&#x9700;&#x8981;&#x66F4;&#x65B0;&#x7279;&#x5B9A;&#x4E00;&#x90E8;&#x5206;&#x72B6;&#x6001;&#x7684; action&#xFF0C;&#x7279;&#x522B;&#x662F;&#x5F53;&#x4F60;&#x4F7F;&#x7528;&#x4E86; <code>combineReducers</code>&#x3002;</p>
<p>&#x4F8B;&#x5982;&#xFF0C;&#x5047;&#x8BBE;&#x60F3;&#x5728;&#x7A0B;&#x5E8F;&#x4E2D;&#x8FFD;&#x8E2A;&#x591A;&#x4E2A;&#x8BA1;&#x6570;&#x5668;&#xFF0C;&#x5206;&#x522B;&#x547D;&#x540D;&#x4E3A;A&#xFF0C;B&#xFF0C;&#x548C;C&#x3002;&#x5B9A;&#x4E49;&#x521D;&#x59CB;&#x7684; <code>counter</code> reducer&#xFF0C;&#x7136;&#x540E;&#x4F7F;&#x7528; <code>combineReducers</code> &#x53BB;&#x8BBE;&#x7F6E;&#x72B6;&#x6001;&#x3002;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">counter</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span> <span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token string">&apos;INCREMENT&apos;</span><span class="token punctuation">:</span>
            <span class="token keyword">return</span> state <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token keyword">case</span> <span class="token string">&apos;DECREMENT&apos;</span><span class="token punctuation">:</span>
            <span class="token keyword">return</span> state <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token keyword">default</span><span class="token punctuation">:</span>
            <span class="token keyword">return</span> state<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> rootReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    counterA <span class="token punctuation">:</span> counter<span class="token punctuation">,</span>
    counterB <span class="token punctuation">:</span> counter<span class="token punctuation">,</span>
    counterC <span class="token punctuation">:</span> counter
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x4E0D;&#x5E78;&#x7684;&#x662F;&#xFF0C;&#x8FD9;&#x6837;&#x8BBE;&#x7F6E;&#x6709;&#x4E00;&#x4E2A;&#x95EE;&#x9898;&#x3002;&#x56E0;&#x4E3A; <code>combineReducers</code> &#x5C06;&#x4F1A;&#x4F7F;&#x7528;&#x76F8;&#x540C;&#x7684;action&#x8C03;&#x7528;&#x6BCF;&#x4E00;&#x4E2A; reducer&#xFF0C;&#x53D1;&#x9001; <code><span class="token punctuation">{</span>type<span class="token punctuation">:</span><span class="token string">&apos;INCREMENT&apos;</span><span class="token punctuation">}</span></code> &#x5B9E;&#x9645;&#x4E0A;&#x5C06;&#x4F1A;&#x5BFC;&#x81F4;&#x6240;&#x6709;&#x4E09;&#x4E2A;&#x8BA1;&#x6570;&#x5668;&#x7684;&#x503C;&#x88AB;&#x589E;&#x52A0;&#xFF0C;&#x800C;&#x4E0D;&#x4EC5;&#x4EC5;&#x662F;&#x5176;&#x4E2D;&#x4E00;&#x4E2A;&#x3002;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x4E00;&#x4E9B;&#x65B9;&#x6CD5;&#x53BB;&#x5C01;&#x88C5; <code>counter</code> &#x7684;&#x903B;&#x8F91;&#xFF0C;&#x4EE5;&#x6B64;&#x6765;&#x4FDD;&#x8BC1;&#x53EA;&#x6709;&#x6211;&#x4EEC;&#x5173;&#x5FC3;&#x7684;&#x8BA1;&#x6570;&#x5668;&#x88AB;&#x66F4;&#x65B0;&#x3002;</p>
<h2 id="%E4%BD%BF%E7%94%A8%E9%AB%98%E9%98%B6-reducer-%E6%9D%A5%E5%AE%9A%E5%88%B6%E8%A1%8C%E4%B8%BA">&#x4F7F;&#x7528;&#x9AD8;&#x9636; Reducer &#x6765;&#x5B9A;&#x5236;&#x884C;&#x4E3A;</h2>
<p>&#x6B63;&#x5982;&#x5728; <a href="SplittingReducerLogic.html">Reducer &#x903B;&#x8F91;&#x62C6;&#x5206;</a> &#x5B9A;&#x4E49;&#x7684;&#x90A3;&#x6837;&#xFF0C;&#x9AD8;&#x9636; reducer &#x662F;&#x4E00;&#x4E2A;&#x63A5;&#x6536; reducer &#x51FD;&#x6570;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x5E76;&#x8FD4;&#x56DE;&#x65B0;&#x7684; reducer &#x51FD;&#x6570;&#x7684;&#x51FD;&#x6570;&#x3002;&#x5B83;&#x4E5F;&#x53EF;&#x4EE5;&#x88AB;&#x770B;&#x4F5C;&#x6210;&#x4E00;&#x4E2A;&#x201C;reducer &#x5DE5;&#x5382;&#x201D;&#x3002;<code>combineReducers</code> &#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x9AD8;&#x9636; reduce &#x7684;&#x4F8B;&#x5B50;&#x3002;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x8FD9;&#x79CD;&#x6A21;&#x5F0F;&#x6765;&#x521B;&#x5EFA;&#x7279;&#x5B9A;&#x7248;&#x672C;&#x7684; reducer &#x51FD;&#x6570;&#xFF0C;&#x6BCF;&#x4E2A;&#x7248;&#x672C;&#x53EA;&#x54CD;&#x5E94;&#x7279;&#x5B9A;&#x7684; action&#x3002;</p>
<p>&#x521B;&#x5EFA;&#x7279;&#x5B9A;&#x7684; reducer &#x6709;&#x4E24;&#x79CD;&#x6700;&#x5E38;&#x89C1;&#x7684;&#x65B9;&#x5F0F;&#xFF0C;&#x4E00;&#x4E2A;&#x662F;&#x4F7F;&#x7528;&#x7ED9;&#x5B9A;&#x7684;&#x524D;&#x7F00;&#x6216;&#x8005;&#x540E;&#x7F00;&#x751F;&#x6210;&#x65B0;&#x7684; action &#x5E38;&#x91CF;&#xFF0C;&#x53E6;&#x4E00;&#x4E2A;&#x662F;&#x5728; action &#x5BF9;&#x8C61;&#x4E0A;&#x9644;&#x52A0;&#x989D;&#x5916;&#x7684;&#x4FE1;&#x606F;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x5B83;&#x4EEC;&#x5927;&#x6982;&#x7684;&#x6837;&#x5B50;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">createCounterWithNamedType</span><span class="token punctuation">(</span>counterName <span class="token operator">=</span> <span class="token string">&apos;&apos;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token function">counter</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">switch</span> <span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">case</span> `INCREMENT_$<span class="token punctuation">{</span>counterName<span class="token punctuation">}</span>`<span class="token punctuation">:</span>
                <span class="token keyword">return</span> state <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">;</span>
            <span class="token keyword">case</span> `DECREMENT_$<span class="token punctuation">{</span>counterName<span class="token punctuation">}</span>`<span class="token punctuation">:</span>
                <span class="token keyword">return</span> state <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">;</span>
            <span class="token keyword">default</span><span class="token punctuation">:</span>
                <span class="token keyword">return</span> state<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">createCounterWithNameData</span><span class="token punctuation">(</span>counterName <span class="token operator">=</span> <span class="token string">&apos;&apos;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token function">counter</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">const</span> <span class="token punctuation">{</span>name<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>name <span class="token operator">!</span><span class="token operator">==</span> counterName<span class="token punctuation">)</span> <span class="token keyword">return</span> state<span class="token punctuation">;</span>

        <span class="token keyword">switch</span> <span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">case</span> `INCREMENT`<span class="token punctuation">:</span>
                <span class="token keyword">return</span> state <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">;</span>
            <span class="token keyword">case</span> `DECREMENT`<span class="token punctuation">:</span>
                <span class="token keyword">return</span> state <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">;</span>
            <span class="token keyword">default</span><span class="token punctuation">:</span>
                <span class="token keyword">return</span> state<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x73B0;&#x5728;&#x6211;&#x4EEC;&#x5E94;&#x8BE5;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x5B83;&#x4EEC;&#x4EFB;&#x4F55;&#x4E00;&#x4E2A;&#x53BB;&#x751F;&#x6210;&#x6211;&#x4EEC;&#x7279;&#x5B9A;&#x7684;&#x8BA1;&#x6570;&#x5668; reducer&#xFF0C;&#x7136;&#x540E;&#x53D1;&#x9001; action&#xFF0C;&#x5E76;&#x53EA;&#x4F1A;&#x5F71;&#x54CD;&#x5173;&#x5FC3;&#x7684;&#x90A3;&#x90E8;&#x5206;&#x7684; state&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">const</span> rootReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    counterA <span class="token punctuation">:</span> <span class="token function">createCounterWithNamedType</span><span class="token punctuation">(</span><span class="token string">&apos;A&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    counterB <span class="token punctuation">:</span> <span class="token function">createCounterWithNamedType</span><span class="token punctuation">(</span><span class="token string">&apos;B&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    counterC <span class="token punctuation">:</span> <span class="token function">createCounterWithNamedType</span><span class="token punctuation">(</span><span class="token string">&apos;C&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token punctuation">{</span>type <span class="token punctuation">:</span> <span class="token string">&apos;INCREMENT_B&apos;</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>store<span class="token punctuation">.</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">// {counterA : 0, counterB : 1, counterC : 0}</span>
</code></pre>
<p>&#x6211;&#x4EEC;&#x5728;&#x67D0;&#x79CD;&#x7A0B;&#x5EA6;&#x4E0A;&#x4E5F;&#x53EF;&#x4EE5;&#x6539;&#x53D8;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#xFF0C;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x66F4;&#x52A0;&#x901A;&#x7528;&#x7684;&#x9AD8;&#x9636; reducer&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x63A5;&#x6536;&#x4E00;&#x4E2A;&#x7ED9;&#x5B9A;&#x7684; reducer&#xFF0C;&#x4E00;&#x4E2A;&#x540D;&#x5B57;&#x6216;&#x8005;&#x6807;&#x8BC6;&#x7B26;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">counter</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span> <span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token string">&apos;INCREMENT&apos;</span><span class="token punctuation">:</span>
            <span class="token keyword">return</span> state <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token keyword">case</span> <span class="token string">&apos;DECREMENT&apos;</span><span class="token punctuation">:</span>
            <span class="token keyword">return</span> state <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token keyword">default</span><span class="token punctuation">:</span>
            <span class="token keyword">return</span> state<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">createNamedWrapperReducer</span><span class="token punctuation">(</span>reducerFunction<span class="token punctuation">,</span> reducerName<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">const</span> <span class="token punctuation">{</span>name<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
        <span class="token keyword">const</span> isInitializationCall <span class="token operator">=</span> state <span class="token operator">===</span> undefined<span class="token punctuation">;</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>name <span class="token operator">!</span><span class="token operator">==</span> reducerName <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span>isInitializationCall<span class="token punctuation">)</span> <span class="token keyword">return</span> state<span class="token punctuation">;</span>

        <span class="token keyword">return</span> <span class="token function">reducerFunction</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span><span class="token punctuation">;</span>    
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> rootReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    counterA <span class="token punctuation">:</span> <span class="token function">createNamedWrapperReducer</span><span class="token punctuation">(</span>counter<span class="token punctuation">,</span> <span class="token string">&apos;A&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    counterB <span class="token punctuation">:</span> <span class="token function">createNamedWrapperReducer</span><span class="token punctuation">(</span>counter<span class="token punctuation">,</span> <span class="token string">&apos;B&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    counterC <span class="token punctuation">:</span> <span class="token function">createNamedWrapperReducer</span><span class="token punctuation">(</span>counter<span class="token punctuation">,</span> <span class="token string">&apos;C&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x751A;&#x81F3;&#x8FD8;&#x53EF;&#x4EE5;&#x5199;&#x4E00;&#x4E2A;&#x901A;&#x7528;&#x7684;&#x9AD8;&#x9636; reducer &#x8FC7;&#x6EE4;&#x5668;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">createFilteredReducer</span><span class="token punctuation">(</span>reducerFunction<span class="token punctuation">,</span> reducerPredicate<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">const</span> isInitializationCall <span class="token operator">=</span> state <span class="token operator">===</span> undefined<span class="token punctuation">;</span>
        <span class="token keyword">const</span> shouldRunWrappedReducer <span class="token operator">=</span> <span class="token function">reducerPredicate</span><span class="token punctuation">(</span>action<span class="token punctuation">)</span> <span class="token operator">||</span> isInitializationCall<span class="token punctuation">;</span>
        <span class="token keyword">return</span> shouldRunWrappedReducer <span class="token operator">?</span> <span class="token function">reducerFunction</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">:</span> state<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> rootReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#x68C0;&#x67E5;&#x540E;&#x7F00;</span>
    counterA <span class="token punctuation">:</span> <span class="token function">createFilteredReducer</span><span class="token punctuation">(</span>counter<span class="token punctuation">,</span> action <span class="token operator">=</span><span class="token operator">&gt;</span> action<span class="token punctuation">.</span>type<span class="token punctuation">.</span><span class="token function">endsWith</span><span class="token punctuation">(</span><span class="token string">&apos;_A&apos;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token comment" spellcheck="true">// &#x68C0;&#x67E5; action &#x4E2D;&#x7684;&#x989D;&#x5916;&#x6570;&#x636E;</span>
    counterB <span class="token punctuation">:</span> <span class="token function">createFilteredReducer</span><span class="token punctuation">(</span>counter<span class="token punctuation">,</span> action <span class="token operator">=</span><span class="token operator">&gt;</span> action<span class="token punctuation">.</span>name <span class="token operator">===</span> <span class="token string">&apos;B&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token comment" spellcheck="true">// &#x54CD;&#x5E94;&#x6240;&#x6709;&#x7684; &apos;INCREMENT&apos; action&#xFF0C;&#x4F46;&#x4E0D;&#x54CD;&#x5E94; &apos;DECREMENT&apos;</span>
    counterC <span class="token punctuation">:</span> <span class="token function">createFilteredReducer</span><span class="token punctuation">(</span>counter<span class="token punctuation">,</span> action <span class="token operator">=</span><span class="token operator">&gt;</span> action<span class="token punctuation">.</span>type <span class="token operator">===</span> <span class="token string">&apos;INCREMENT&apos;</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x8FD9;&#x4E9B;&#x57FA;&#x672C;&#x7684;&#x6A21;&#x5F0F;&#x53EF;&#x4EE5;&#x8BA9;&#x4F60;&#x5728; UI &#x5185;&#x5904;&#x7406;&#x4E00;&#x4E2A;&#x667A;&#x80FD;&#x8FDE;&#x63A5;&#x7684; component &#x7684;&#x591A;&#x4E2A;&#x5B9E;&#x4F8B;&#x3002;&#x5BF9;&#x4E8E;&#x50CF;&#x5206;&#x9875;&#x6216;&#x8005;&#x6392;&#x5E8F;&#x8FD9;&#x4E9B;&#x901A;&#x7528;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x53EF;&#x4EE5;&#x590D;&#x7528;&#x76F8;&#x540C;&#x7684;&#x903B;&#x8F91;&#x3002;</p>

                    
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